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CXLE88180 constant current LED driver chip: high-precision, multi-channel, flexible and adjustable display and lighting solutions

In the LED display and lighting system, the accuracy of the driver chip, the number of channels and the response speed directly affect the brightness consistency, energy efficiency and refresh rate of the overall system. As a high-performance 16-channel constant current driver chip designed for indoor and outdoor full-color LED display, lighting and energy-saving lighting, CXLE88180 has become the first choice for many engineers and system integrators with its excellent current accuracy, flexible current regulation and high-speed data transmission capability. This article will comprehensively analyze the technical advantages, electrical characteristics, application configuration and system design suggestions of the CXLE88180 to help users achieve more efficient and stable LED driver design.bdM嘉泰姆

1. product overview and core advantages

CXLE88180 is an LED driver IC with integrated CMOS shift register and latch. It has 16 constant current output channels, and the current of each channel can be precisely adjusted in the range of 3mA to 36mA(VDD = 5V) or 3mA to 20mA(VDD = 3.3V). The chip supports up to 25MHz data transmission rate, the minimum pulse width response of 35ns, suitable for high refresh rate, high gray level LED display system.bdM嘉泰姆

Its core strengths include:bdM嘉泰姆

•   High precision current output: Inter-channel error ≤ ± 2.0%, inter-chip error ≤ ± 3.0%, to ensure uniform brightness;bdM嘉泰姆

•   Flexible adjustable current: through the external resistor (REXT) accurately set the output current, adapt to different brightness requirements;bdM嘉泰姆

•   High output withstand voltageThe output port supports up to 11V withstand voltage to improve system reliability;bdM嘉泰姆

•   high-speed data transmission: Support 25MHz clock frequency, suitable for high-definition dynamic display;bdM嘉泰姆

•   Dual package option: Provide 1200.00g kinds of SSOP24-0.635 and QFN packages to adapt to different wiring and heat dissipation requirements.bdM嘉泰姆

2. pin function and internal structure

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The CXLE88180 is available in a 24-pin package and the main functional pins include:bdM嘉泰姆

The chip integrates a 16-bit shift register, a data latch and a constant current control circuit to realize efficient conversion from serial data to parallel output, and precisely controls each output current through an external resistor.bdM嘉泰姆

3. electrical characteristics and operating performance

3.1. Supply voltage and output range

•   Operating voltage：3.3V～5.5VbdM嘉泰姆

•   Output current range：bdM嘉泰姆

VDD=5V：3mA～36mAbdM嘉泰姆

VDD=3.3V：3mA～20mAbdM嘉泰姆

•   Output withstand voltage: Up to 11VbdM嘉泰姆

•   Quiescent currentTypical value: 1.7mA ~ 1.9mA (no load)bdM嘉泰姆

3.2. Current accuracy and temperature stability

•   inter-channel error：±2.0%（max）bdM嘉泰姆

•   inter-chip error：±3.0%（max）bdM嘉泰姆

•   Current changes with voltage：±1.0%/V（max）bdM嘉泰姆

•   Current varies with output voltage drop：±0.1%/V（max）bdM嘉泰姆

CXLE88180 built-in parity channel delay mechanism (20ns), effectively reduce the power supply noise and current impact, improve the system EMC performance.bdM嘉泰姆

3.3. Switching characteristics

•   Output rise time：35ns（max）bdM嘉泰姆

•   Output fall time：50ns（max）bdM嘉泰姆

•   Maximum clock frequency：25MHzbdM嘉泰姆

•   Minimum OE Pulse Width：35nsbdM嘉泰姆
3.3.1)VDD=5.0VbdM嘉泰姆
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(1) The conditions for these values are: the shortest OE under the condition that the output channel maintains a consistent response.bdM嘉泰姆
(2) The delay time between the even channel OUT2n (such as OUT0,OUT2,OUT4,OUT6, etc.) and the odd channel OUT2n 1 (such as OUT1,OUT3,OUT5,OUT7, etc.) is 20nS. CXLE88180 the built-in delay circuit function, the odd and even output channels can be turned on at different times to reduce the amount of current on the power line.bdM嘉泰姆

3.3.2)VDD=3.3VbdM嘉泰姆
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3.4. Limit parametersbdM嘉泰姆
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(1) These grades in the above table cannot allow the chip to work at the limit value for a long time. If the chip works at the limit value for a long time, it is easy to reduce the reliability of the device and maybdM嘉泰姆
Permanent damage can occur. It is not recommended to operate the chip beyond these limit parameters under any other conditions.bdM嘉泰姆
(2) All voltage values are measured relative to the network.bdM嘉泰姆
3.5. Electrical characteristicsbdM嘉泰姆

3.5.1)VDD=5VbdM嘉泰姆

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3.5.2)VDD=3.3VbdM嘉泰姆
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4. current setting and formula calculation

The output current can be accurately set by an external resistor (R-EXT), and the calculation formula is as follows:bdM嘉泰姆

I_OUT=(1.18V /R_REF​) × 15bdM嘉泰姆
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R in the formula_IREFRefers to the resistance of the R-EXT terminal. When the resistance value is 600 Ω, the output current value is 29.5mA calculated by the formula. When the electricitybdM嘉泰姆
When the resistance value is 1KΩ, the output current is 17.7mA.

Examples:bdM嘉泰姆

•   若 R-EXT = 600Ω，则 IOUT​≈29.5mAbdM嘉泰姆

•   若 R-EXT = 1kΩ，则 IOUT​≈17.7mAbdM嘉泰姆

Users can flexibly select the resistance value according to the actual LED specifications and brightness requirements to achieve accurate brightness control.bdM嘉泰姆
Constant currentbdM嘉泰姆
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       The R-EXT pin is connected to GND with different resistance values to obtain different constant currents at the output of the OUT pin, but different constant currents enter the constant current.bdM嘉泰姆
The voltage at the flow turning point is different. As can be seen in the figure, the constant current voltage point & asymp at 30mA; 0.6V, while the constant current voltage point drops to & asymp at 20mA; 0.5V,bdM嘉泰姆
When designing the circuit, the voltage drop at the OUTx end should be fully considered to avoid the driving current not reaching the set value.bdM嘉泰姆
In addition, the OUTx terminal is not suitable to work at a high voltage drop for a long time when it is turned on, which will increase the power loss of the chip, resulting inbdM嘉泰姆
The heat of the chip is serious, which affects the stability of the system.bdM嘉泰姆
In practical application, may be due to signal traces or other factors of electromagnetic interference, in order to avoid such failures, it is recommended to CXLE88180bdM嘉泰姆
The shorter the distance from the LED display module, the better.bdM嘉泰姆

5. typical application scenarios

CXLE88180 are widely used in the following areas:bdM嘉泰姆

1. Full color LED display

•   Indoor and outdoor advertising screenbdM嘉泰姆

•   Stage background screenbdM嘉泰姆

•   Information release screenbdM嘉泰姆

2. Landscape lighting and lighting

•   Architectural contour lightingbdM嘉泰姆

•   RGB light stripbdM嘉泰姆

•   urban lighting engineeringbdM嘉泰姆

3. General lighting system

•   Energy-saving lamps and lanternsbdM嘉泰姆

•   Dimming lighting systembdM嘉泰姆

The chip supports multi-chip cascading and can be easily extended to large displays or complex lighting networks.bdM嘉泰姆

6. system design recommendations

1. PCB layout and heat dissipation

•   It is recommended to arrange the R-EXT resistor close to the chip to reduce noise interference;bdM嘉泰姆

•   The bottom of the QFN package is provided with a metal heat dissipation pad, which should be well grounded and properly paved with copper;bdM嘉泰姆

•   The output line width should meet the current carrying requirements to avoid excessive voltage drop.bdM嘉泰姆

2. Power supply and decoupling

•   The power pins should be connected in parallel with 10μF and 100nF capacitors to filter out high-frequency noise;bdM嘉泰姆

•   It is recommended to set up independent power branches every 3 to 5 chips to avoid current concentration.bdM嘉泰姆

3. Signal integrity

•   CLK, SDI and other high-speed signal lines should maintain the same length, short path wiring;bdM嘉泰姆

•   It is recommended to use terminal matching resistors in long distance transmission.bdM嘉泰姆

4. Thermal Management

•   If the output current is large or the output voltage drop is high, it is recommended to add a heat sink or fan;bdM嘉泰姆

•   Avoid the chip working in a high temperature environment for a long time.bdM嘉泰姆

7. performance characteristics

7.1. Dynamic characteristic test circuit:In order to avoid the mutual influence of the parity channels, the parity channel is independently connected to the power supply during the test.bdM嘉泰姆

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7.2. Timing characteristicsbdM嘉泰姆

7.2.1) Communication TimingbdM嘉泰姆
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7.2.2）Channel output timingbdM嘉泰姆
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7.3. Logic DiagrambdM嘉泰姆

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8. Encapsulation InformationbdM嘉泰姆

CXLE88180 offers two packaging options:bdM嘉泰姆

•   SSOP24-0.635: Pin spacing 0.635mm, suitable for general mounting;bdM嘉泰姆

•   QFN24: 4mm × 4mm, with heat dissipation pad at the bottom, suitable for high-density wiring and high heat consumption scenarios.bdM嘉泰姆

Both packages are RoHS compliant and support automated patch and reflow processes.bdM嘉泰姆

9. epilogue

With its 16-channel high-precision output, flexible current regulation, high-speed data transmission and excellent system compatibility, the CXLE88180 has become an ideal choice for LED display and lighting drivers. Whether it is a full-color display with a high refresh rate or a lighting system that requires extremely high brightness consistency, CXLE88180 can provide stable, efficient and reliable drive support.bdM嘉泰姆

If you need to obtain CXLE88180 samples, technical information or apply for technical support, please visitjtm-ic.comWe are committed to providing customers with complete LED driver solutions and supply chain services.bdM嘉泰姆

10. Related Chip Selection GuideMore similar products.....bdM嘉泰姆

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